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VulnerabilityPublished Updated

CVE-2026-63871: Linux kernel · Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ab84fd7779a2a7ff5d2c8eac212c43733f56216e : update Linux kernel when convenient.

Data as of 30 Oct 2026, 13:33 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
Patch
Available – fixed in ab84fd7779a2a7ff5d2c8eac212c43733f56216e, 9798f7d41d85ff763afd1f1cc0533b5c416c8348, 859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=6.1.9 <6.1.191
Fixed in
  • ab84fd7779a2a7ff5d2c8eac212c43733f56216e
  • 9798f7d41d85ff763afd1f1cc0533b5c416c8348
  • 859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020
  • 122b6a8b0c75b5f808aa6ea68e97103330b9ffa7
  • 9ca7053d6215d89c33f28893bfd1625a32919d3f
  • 6.1.191
LinuxLinuxAffected
  • =6.2
Fixed in–

AI-suggested

This issue is fixed in Linux kernel versions 6.1.191 and later. Users and administrators should update to version 6.1.191 or apply the corresponding patches to their kernel to remediate this vulnerability. No additional mitigation steps are required beyond applying the official fix.

Description

A data-race vulnerability in the Linux kernel's Bluetooth ISO implementation was fixed. The issue involved concurrent access to iso_pi fields in hci_get_route calls without proper locking, leading to potential data races detected by the Kernel Concurrency Sanitizer (KCSAN). The flaw was addressed by snapshotting the relevant fields under lock_sock() before use.

References

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